شماره ركورد كنفرانس :
4518
عنوان مقاله :
Solvent extraction of silver from nitrate solutions by mono/di 2- ethylhexyl phosphoric acid ester (MDEHPA)
Author/Authors :
Saeed Laki Membrane Processes Research Laboratory (MPRL), Department of Petrochemical Eng., Amirkabir University of Technology, Mahshahr Campus, Mahshahr, Iran , Ali Kargari Membrane Processes Research Laboratory (MPRL), Department of Petrochemical Eng., Amirkabir University of Technology, Mahshahr Campus, Mahshahr, Iran , Ahmad Arabi Shamsabadi Membrane Processes Research Laboratory (MPRL), Department of Petrochemical Eng., Amirkabir University of Technology, Mahshahr Campus, Mahshahr, Iran
كليدواژه :
Solvent extraction , silver , MDEHPA , pH , contact time , extractant concentration
عنوان كنفرانس :
The 7th International Chemical Engineering Congress & Exhibition (IChEC 2011
چكيده لاتين :
Solvent extraction has been a very effective unit operation in hydrometallurgy.In this paper,
experimentqal study of solvent extraction is presented for extraction of silver from nitrate solution
using mono/di 2-ethylhexyl phosphoric acid ester (MDEHPA) in an industrial organic solvent
(mainly paraffinic and naphthenic hydrocarbon in C10- C14 range). Effect of operation parameters
such as pH, contact time and extractant concentration were investigated. Stoichiometry equation of
the silver extraction process with MDEHPA has been proposed too. Because of aciditic property
of MDEHPA, the extraction increased with pH to 100%. The formation of precipitate was
occurred at pH 9, due to hydrolysis phenomena of silver. The extraction of silver at low
equilibrium pH is low, due to the protonation effect of H+ on MDEHPA. Results indicate the
extraction of Ag(I) (74.8 %) was quite rapid and attained the equilibrium within one minute.
Also long contact time had no adverse effect on extraction The MDEHPA has a good extraction
performance at pH 7.5 - 8 , also silver extraction will increase by increasing concentration of
MDEHPA.
